The nation's big insurers are spending millions to carry out President Barack Obama's health care overhaul even though there's a chance the wide-reaching law won't survive Supreme Court scrutiny.

Cigna Corp. CEO David M. Cordani's total compensation climbed 25 percent last year, as the nation's fourth-largest health insurer launched a $3.8 billion acquisition, and its stock outperformed the broader market.

The Health and Human Services department recently announced what will be required in user-friendly coverage summary forms, but insurers won't have to comply with the requirement until September. In the meantime, here are some key points to keep in mind when picking a new plan.

Express Scripts Inc. says it is doing fine after breaking up with pharmacy operator Walgreen Co., but it won't rule out getting back together with the largest U.S. drugstore chain.

Medco Health Solutions Inc.'s fourth-quarter net income rose 12 percent, as gains from generic prescriptions and the pharmacy benefits manager's specialty business helped offset costs from its pending acquisition by Express Scripts Inc.

UnitedHealth Group's Optum business is launching a service that allows doctors to share information about patients over the Internet, as health care companies continue their push to improve care with better coordination.

CVS Caremark Corp.'s fourth-quarter earnings climbed nearly 4 percent as the drugstore operator's pharmacy services revenue swelled because of a long-term contract and new business.

Health insurer Aetna Inc.'s fourth-quarter net income jumped 73 percent, as it continued to benefit from low use of health care and some key expenses fell.